Abomination no. 23: Glass Boy

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He's not actually made of glass, his body is just ideally transparent, and he perfectly blends with his surroundings... And Von Charlatain named him like that, because Chamelleon Boy sounded too cheesy......

...Not to mention that chameleons don't change colour to blend into the background; it's based on their mood. If you see a chameleon that's the same colour as its surroundings, that's just a lucky coincidence.